Kill 50 zombies in one game
Kill 100 zombies in on game
Kill 200 zombies in one game
Make a 20 combo
Kill 300 zombies in one game
Make a 50 combo
Make a 100 combo
Kill 1000 zombies in one game
Kill a total of 500 zombies
Kill a total of 5000 zombies
Kill a total of 1000 zombies